Incandescent lamp



Jan. 22 1924, 1,481,680

C. BRINDEL INCANDESGENT LAMP Filed Jan. 10 1921 Clydejfz'wde EN-re Ga-WM a; 71mg! ATTORNEY Patented den. 22, 1 924.

intro orice;

i CLYDE BRIHDEL, F YORKTOWN, INDIANA.

INCANDESCEN '1 LAMP.

Application filed January 10,1921. Serial No. 438,189.

'Lamps, of which the following is a specification.

This invention relates to incandescent electric light bulbs and an object of the invention is to provide a lamp embodying a pair of filaments whereb the wattage of and consequently the lig't created by the lamp bulb may be increased if desired.

At times, it is desirable to have av very bright light and at other times such light is not necessary or desired and under present conditions, it is necessary to have two lamp bulbs to provide this change in light, however, it is an object of this invention to provide a single lamp bulb having a pair of spaced filaments, one of which may be disconnected for remaining idle or inactive and connected in the energized circuit, when de sired, to increase the intensity of the light produced by the bulb.

Other objects of the invention will appear in the following detailed description taken in connection with the accompanying drawings wherein:

Fig. 1 is a longitudinal section through the improved incandescent lamp bulb.

Fig. 2 is a horizontal section through the lamp bulb taken on the line 22 of Fig. 1. Fig. 3 is a horizontal section through the lamp bulb taken on the line 3-3 of Fig. 1.

Fig. 4 is a horizontal section through the improved lamp bulb taken on the line li of Fig. 1.

Referring more particularly to the draw-' ings, the improved lamp bulb comprises the usual transparent bulb 1 which is hermetically sealed in the usual manner and the stem 2 of which has an external threaded shell 3 mounted thereon and formed of brass or other suitable conducting material. The end of the stem 2 is solid, as clearly shown at 4 in Fig. l of the drawing and a centrally extending post 5, of glass, projects axially through the stem 2 and into the main bod of the bulb 1.

A portion of the post 5 is hollow and has the usual fabric wadding therein as at 6 through which the wires 7, 8 and 9 extend. The wire 9, extends laterally through the solid portion 4 of the stem 2 and is soldered or otherwise suitably attached to the sleeve 3 as shown at 10. The end of the Wire 9 remote from the end supported to the sleeve 3 extends through an insulating disc 11, preferably formed of glass, and upon the lower end of the post 5. This wire 9 has an upturned filament supporting wire 12 connected thereto to which a filament 13 of the usual composition is connected. This filament 13 is also connected to the upturned end 14 of the wire 7, as clearly shown in Fig. l of the drawings and thus the circuit is completed through the wire 7, upturnedend 14, filament 13, upturned wire 12 back through the wire 9 to the shell 3. A supporting wire 15 is carried by the insulating disc 11 and co acts with the upturned wires 12 and 14 in supporting the filament 13 in triangular shape. The wire 9 projects through the disc l1 of insulation and it has its lower end 17 rolled in the usual manner, to support a filament, and the wire 8 also extends through the disc 11 and filament 18 is connected to the lower ends of the wires 8 and 9 and to a dummy supporting wire 19 which is carried by the disc 11. The filament 18 is supported in triangular shape,

with its points disposed staggered relative to the points of the upper filament 13, as clearly shown in Fig. 2 of the drawing, thus forming a substantially star shaped filament or light when both filaments are in o eration. The wire 8 extends upwardly through the hollow portion of the post 5 and is connected, at its upper end, to the flange 20 formed on the sleeve 21. The sleeve 21 is embedded in the solid end of the stem 2 and has a cap 22 threadably mounted thereon, the cover 23 of which is adapted for engagement with the central contact of a lamp socket while the sleeve 3 is in engagement with the side contact of the socket thus permitting the closing of an energizing circuit through the wires 8 and 9 and consequently through the filament 18. A collar or sleeve 24 of insulation is placed within the sleeve 21 and has a socket 25 seat ed centrally in its lower end to which the wire 7 is connected. Electrical connection between the cover 23 and socket 25 is bad through a removable pin26 and thus when the pin 26 has its lower end inserted in the socket 25 and its upper end inserted in the socket 27, formed on the cover 23, electrical connection is established which permits energizing current to flow through the pin 26, socket 25, wire 7, filament 13 and back through wire 9, this latter wire being heavy enough to carry the load 0t both supply wires? and 8. When the pin 26 is in place the upper and lower filaments l3 and 18 will be excited or energized causing an increased wattage of the lamp and consequently increased generation of light therein. The pin 26 is removable and when 1t 13 desired only to have the lower filament 18 energized, the cap 22 is unscrewed from the sleeve 21 and the pin 26 removed, which, when the cap 22 is again threaded upon the sleeve 21, permits energizing current to flow only through the wires 8 and 9 and filament 18.

The improved incandescent lamp bulib theretofore described and illustrated in the drawings is particularly designed for lamps of heavy or high wattage, such as 100 and 200 wattage lamps, each of the filaments being of 100 watt intensity and thus when they are both energized 200 watt bulb will be provided.

From the foregoing description taken in connection with the accompanying drawing it will be apparent that a lamp has been provided in which the normal wattage may be increased in any proportion permitting the energizing of a relatively great light or relatively dim light by a single bulb and eliminating the necessity of having two bulbs which must be changed when a change in wattage is desired.

It is, of course, to be understood that the invention may be constructed in various other manners and the parts associated in different relations and, therefore, I do not desire to be limited in any manner except as set forth' in the claims hereunto appended.

Having thus described my invention what I claim is: p

1. In an incandescent lamp, a base, a filamen t, a feed wire connected to one end of said filament, a supporting sleeve carried axiall by said base, a second feed wire connected to the other end of said filament, a removable contact cap carried by said sleeve and a contact pin carried by said cap for movement into engagement with said sec ond feed wire.

2. In an incandescent lamp, a base, a fila- 1nent,afeed wire connected to said filament. a supporting sleeve carried by said base and having a feed wire connected thereto and to said filament, a removable contact cap carried by said sleeve, a second filament, a socket on said base, a feed wire for said second filament connected to the second filament and said socket, a removable pin engageable between said socket and said cap for permitting energizing of said second filament.

3. In an incandescent lamp, a base, a pair of spaced filaments insulated one from the other, supply wires connected to said filaments, a single return wire connected to both of said filaments, asupporting sleeve carried by said base and having one of said feed wires connected thereto, a removable contact cap carried by said sleeve, a socket on said base, the feed wire for said second filament connectedto the second filament and said socket, and a removable contact pin engageablebetween said socket and said cap for permitting energizing of the second filament.

In testimony whereof I afiix my signature.

CLYDE BRINDEL. 

